drivers/gpu/drm/exynos/exynos_drm_fb.c

   1 /* exynos_drm_fb.c
   2  *
   3  * Copyright (c) 2011 Samsung Electronics Co., Ltd.
   4  * Authors:
   5  *      Inki Dae <inki.dae@samsung.com>
   6  *      Joonyoung Shim <jy0922.shim@samsung.com>
   7  *      Seung-Woo Kim <sw0312.kim@samsung.com>
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a
  10  * copy of this software and associated documentation files (the "Software"),
  11  * to deal in the Software without restriction, including without limitation
  12  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  13  * and/or sell copies of the Software, and to permit persons to whom the
  14  * Software is furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice (including the next
  17  * paragraph) shall be included in all copies or substantial portions of the
  18  * Software.
  19  *
  20  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  21  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  23  * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  24  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  25  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  26  * OTHER DEALINGS IN THE SOFTWARE.
  27  */
  28
  29 #include <drm/drmP.h>
  30 #include <drm/drm_crtc.h>
  31 #include <drm/drm_crtc_helper.h>
  32 #include <drm/drm_fb_helper.h>
  33 #include <uapi/drm/exynos_drm.h>
  34
  35 #include "exynos_drm_drv.h"
  36 #include "exynos_drm_fb.h"
  37 #include "exynos_drm_gem.h"
  38 #include "exynos_drm_iommu.h"
  39 #include "exynos_drm_encoder.h"
  40
  41 #define to_exynos_fb(x) container_of(x, struct exynos_drm_fb, fb)
  42
  43 /*
  44  * exynos specific framebuffer structure.
  45  *
  46  * @fb: drm framebuffer obejct.
  47  * @buf_cnt: a buffer count to drm framebuffer.
  48  * @exynos_gem_obj: array of exynos specific gem object containing a gem object.
  49  */
  50 struct exynos_drm_fb {
  51         struct drm_framebuffer          fb;
  52         unsigned int                    buf_cnt;
  53         struct exynos_drm_gem_obj       *exynos_gem_obj[MAX_FB_BUFFER];
  54 };
  55
  56 static int check_fb_gem_memory_type(struct drm_device *drm_dev,
  57                                 struct exynos_drm_gem_obj *exynos_gem_obj)
  58 {
  59         unsigned int flags;
  60
  61         /*
  62          * if exynos drm driver supports iommu then framebuffer can use
  63          * all the buffer types.
  64          */
  65         if (is_drm_iommu_supported(drm_dev))
  66                 return 0;
  67
  68         flags = exynos_gem_obj->flags;
  69
  70         /*
  71          * without iommu support, not support physically non-continuous memory
  72          * for framebuffer.
  73          */
  74         if (IS_NONCONTIG_BUFFER(flags)) {
  75                 DRM_ERROR("cannot use this gem memory type for fb.\n");
  76                 return -EINVAL;
  77         }
  78
  79         return 0;
  80 }
  81
  82 static void exynos_drm_fb_destroy(struct drm_framebuffer *fb)
  83 {
  84         struct exynos_drm_fb *exynos_fb = to_exynos_fb(fb);
  85         unsigned int i;
  86
  87         DRM_DEBUG_KMS("%s\n", __FILE__);
  88
  89         /* make sure that overlay data are updated before relesing fb. */
  90         exynos_drm_encoder_complete_scanout(fb);
  91
  92         drm_framebuffer_cleanup(fb);
  93
  94         for (i = 0; i < ARRAY_SIZE(exynos_fb->exynos_gem_obj); i++) {
  95                 struct drm_gem_object *obj;
  96
  97                 if (exynos_fb->exynos_gem_obj[i] == NULL)
  98                         continue;
  99
 100                 obj = &exynos_fb->exynos_gem_obj[i]->base;
 101                 drm_gem_object_unreference_unlocked(obj);
 102         }
 103
 104         kfree(exynos_fb);
 105         exynos_fb = NULL;
 106 }
 107
 108 static int exynos_drm_fb_create_handle(struct drm_framebuffer *fb,
 109                                         struct drm_file *file_priv,
 110                                         unsigned int *handle)
 111 {
 112         struct exynos_drm_fb *exynos_fb = to_exynos_fb(fb);
 113
 114         DRM_DEBUG_KMS("%s\n", __FILE__);
 115
 116         return drm_gem_handle_create(file_priv,
 117                         &exynos_fb->exynos_gem_obj[0]->base, handle);
 118 }
 119
 120 static int exynos_drm_fb_dirty(struct drm_framebuffer *fb,
 121                                 struct drm_file *file_priv, unsigned flags,
 122                                 unsigned color, struct drm_clip_rect *clips,
 123                                 unsigned num_clips)
 124 {
 125         DRM_DEBUG_KMS("%s\n", __FILE__);
 126
 127         /* TODO */
 128
 129         return 0;
 130 }
 131
 132 static struct drm_framebuffer_funcs exynos_drm_fb_funcs = {
 133         .destroy        = exynos_drm_fb_destroy,
 134         .create_handle  = exynos_drm_fb_create_handle,
 135         .dirty          = exynos_drm_fb_dirty,
 136 };
 137
 138 void exynos_drm_fb_set_buf_cnt(struct drm_framebuffer *fb,
 139                                                 unsigned int cnt)
 140 {
 141         struct exynos_drm_fb *exynos_fb;
 142
 143         exynos_fb = to_exynos_fb(fb);
 144
 145         exynos_fb->buf_cnt = cnt;
 146 }
 147
 148 unsigned int exynos_drm_fb_get_buf_cnt(struct drm_framebuffer *fb)
 149 {
 150         struct exynos_drm_fb *exynos_fb;
 151
 152         exynos_fb = to_exynos_fb(fb);
 153
 154         return exynos_fb->buf_cnt;
 155 }
 156
 157 struct drm_framebuffer *
 158 exynos_drm_framebuffer_init(struct drm_device *dev,
 159                             struct drm_mode_fb_cmd2 *mode_cmd,
 160                             struct drm_gem_object *obj)
 161 {
 162         struct exynos_drm_fb *exynos_fb;
 163         struct exynos_drm_gem_obj *exynos_gem_obj;
 164         int ret;
 165
 166         exynos_gem_obj = to_exynos_gem_obj(obj);
 167
 168         ret = check_fb_gem_memory_type(dev, exynos_gem_obj);
 169         if (ret < 0) {
 170                 DRM_ERROR("cannot use this gem memory type for fb.\n");
 171                 return ERR_PTR(-EINVAL);
 172         }
 173
 174         exynos_fb = kzalloc(sizeof(*exynos_fb), GFP_KERNEL);
 175         if (!exynos_fb) {
 176                 DRM_ERROR("failed to allocate exynos drm framebuffer\n");
 177                 return ERR_PTR(-ENOMEM);
 178         }
 179
 180         exynos_fb->exynos_gem_obj[0] = exynos_gem_obj;
 181
 182         ret = drm_framebuffer_init(dev, &exynos_fb->fb, &exynos_drm_fb_funcs);
 183         if (ret) {
 184                 DRM_ERROR("failed to initialize framebuffer\n");
 185                 return ERR_PTR(ret);
 186         }
 187
 188         drm_helper_mode_fill_fb_struct(&exynos_fb->fb, mode_cmd);
 189
 190         return &exynos_fb->fb;
 191 }
 192
 193 static u32 exynos_drm_format_num_buffers(struct drm_mode_fb_cmd2 *mode_cmd)
 194 {
 195         unsigned int cnt = 0;
 196
 197         if (mode_cmd->pixel_format != DRM_FORMAT_NV12)
 198                 return drm_format_num_planes(mode_cmd->pixel_format);
 199
 200         while (cnt != MAX_FB_BUFFER) {
 201                 if (!mode_cmd->handles[cnt])
 202                         break;
 203                 cnt++;
 204         }
 205
 206         /*
 207          * check if NV12 or NV12M.
 208          *
 209          * NV12
 210          * handles[0] = base1, offsets[0] = 0
 211          * handles[1] = base1, offsets[1] = Y_size
 212          *
 213          * NV12M
 214          * handles[0] = base1, offsets[0] = 0
 215          * handles[1] = base2, offsets[1] = 0
 216          */
 217         if (cnt == 2) {
 218                 /*
 219                  * in case of NV12 format, offsets[1] is not 0 and
 220                  * handles[0] is same as handles[1].
 221                  */
 222                 if (mode_cmd->offsets[1] &&
 223                         mode_cmd->handles[0] == mode_cmd->handles[1])
 224                         cnt = 1;
 225         }
 226
 227         return cnt;
 228 }
 229
 230 static struct drm_framebuffer *
 231 exynos_user_fb_create(struct drm_device *dev, struct drm_file *file_priv,
 232                       struct drm_mode_fb_cmd2 *mode_cmd)
 233 {
 234         struct drm_gem_object *obj;
 235         struct drm_framebuffer *fb;
 236         struct exynos_drm_fb *exynos_fb;
 237         int i;
 238
 239         DRM_DEBUG_KMS("%s\n", __FILE__);
 240
 241         obj = drm_gem_object_lookup(dev, file_priv, mode_cmd->handles[0]);
 242         if (!obj) {
 243                 DRM_ERROR("failed to lookup gem object\n");
 244                 return ERR_PTR(-ENOENT);
 245         }
 246
 247         fb = exynos_drm_framebuffer_init(dev, mode_cmd, obj);
 248         if (IS_ERR(fb)) {
 249                 drm_gem_object_unreference_unlocked(obj);
 250                 return fb;
 251         }
 252
 253         exynos_fb = to_exynos_fb(fb);
 254         exynos_fb->buf_cnt = exynos_drm_format_num_buffers(mode_cmd);
 255
 256         DRM_DEBUG_KMS("buf_cnt = %d\n", exynos_fb->buf_cnt);
 257
 258         for (i = 1; i < exynos_fb->buf_cnt; i++) {
 259                 struct exynos_drm_gem_obj *exynos_gem_obj;
 260                 int ret;
 261
 262                 obj = drm_gem_object_lookup(dev, file_priv,
 263                                 mode_cmd->handles[i]);
 264                 if (!obj) {
 265                         DRM_ERROR("failed to lookup gem object\n");
 266                         exynos_drm_fb_destroy(fb);
 267                         return ERR_PTR(-ENOENT);
 268                 }
 269
 270                 exynos_gem_obj = to_exynos_gem_obj(obj);
 271
 272                 ret = check_fb_gem_memory_type(dev, exynos_gem_obj);
 273                 if (ret < 0) {
 274                         DRM_ERROR("cannot use this gem memory type for fb.\n");
 275                         exynos_drm_fb_destroy(fb);
 276                         return ERR_PTR(ret);
 277                 }
 278
 279                 exynos_fb->exynos_gem_obj[i] = to_exynos_gem_obj(obj);
 280         }
 281
 282         return fb;
 283 }
 284
 285 struct exynos_drm_gem_buf *exynos_drm_fb_buffer(struct drm_framebuffer *fb,
 286                                                 int index)
 287 {
 288         struct exynos_drm_fb *exynos_fb = to_exynos_fb(fb);
 289         struct exynos_drm_gem_buf *buffer;
 290
 291         DRM_DEBUG_KMS("%s\n", __FILE__);
 292
 293         if (index >= MAX_FB_BUFFER)
 294                 return NULL;
 295
 296         buffer = exynos_fb->exynos_gem_obj[index]->buffer;
 297         if (!buffer)
 298                 return NULL;
 299
 300         DRM_DEBUG_KMS("dma_addr = 0x%lx\n", (unsigned long)buffer->dma_addr);
 301
 302         return buffer;
 303 }
 304
 305 static void exynos_drm_output_poll_changed(struct drm_device *dev)
 306 {
 307         struct exynos_drm_private *private = dev->dev_private;
 308         struct drm_fb_helper *fb_helper = private->fb_helper;
 309
 310         if (fb_helper)
 311                 drm_fb_helper_hotplug_event(fb_helper);
 312 }
 313
 314 static const struct drm_mode_config_funcs exynos_drm_mode_config_funcs = {
 315         .fb_create = exynos_user_fb_create,
 316         .output_poll_changed = exynos_drm_output_poll_changed,
 317 };
 318
 319 void exynos_drm_mode_config_init(struct drm_device *dev)
 320 {
 321         dev->mode_config.min_width = 0;
 322         dev->mode_config.min_height = 0;
 323
 324         /*
 325          * set max width and height as default value(4096x4096).
 326          * this value would be used to check framebuffer size limitation
 327          * at drm_mode_addfb().
 328          */
 329         dev->mode_config.max_width = 4096;
 330         dev->mode_config.max_height = 4096;
 331
 332         dev->mode_config.funcs = &exynos_drm_mode_config_funcs;
 333 }